Lock washer



Sept. 16 1930.

A. H. THOMPSON LOCK WASHER Filed May 20. 1929 By. M-AZQ ARTHUR H. THO? SON, OF CHICAGO, ILLINOIS, ASSIGNOR T THOMPSON BREMER &

filth, 01E GGAGU, ILLINOIS, A. CORQPURATION 03E ILLINOIS LGGZK WASHER Application filed may 20, 19%. serial No. 364,351.

The invention relates generally to lockwashers for nuts. More particularly the invention relates to that type of lock washer which comprises a substantially flat ringg shaped body having one of the margins thereof cut so as to form pairs of tongues which face one another and are bent in opposite directions so as to grip or engage the contiguous faces of the nut and work in order m to prevent rotation of the nut.

Une object of the invention is to provide a lock washer ofthe aforementioned type in which the ring-shaped body is so cut or formed that the tongues cannot overlap in the event that they stretch as a result of being bent relatively to the body.

Anotherobject oi the invention is to provide a lock washer which is generally of new and im roved construction, may be manutacture v at a'comparatively low cost and is exceedingly eficient in operation.

Qther objects of the invention and the various advantages and characteristics of the resent washer construction will be apparent rom a consideration of the following de tailed description.

The invention consists in the several novel features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawing which accompanies and forms a part of this specificatlon or disclosure and in which like numerals of reference denote corres%onding parts throughout the several views: ig. 1 is'a lan of a washer embodying the invention. ig. 2 is a sectional view showing'the washer on a bolt which is used to secure together in clamped relation a pair of plates. Fig. 3 is a perspective of a portion of the washer on an enlared scale. Fig. 4 is-a lan of a washer embowying a secon or mo ified form of the invention. a

The lock-washer which forms the subject matter of this invention is formed of sheet 'metal and comprises an annular or ringshaped body'5. The latter is provided with a central openin 6 for receiving the shank a of a bolt (1. This bolt, as illustratedin the drawing, is associated with a plate I) and embodies a nut (1 The washer is adapted to lock the nut a against rotation relatively to the bolt a and the plate or work 6. An annular series of notches 7 is cut in the body of the washer. These notches extend radially outward from the hole 6 and are formed so that the sides thereof are substantially parallel. The portion of the body that is disposed at one side of each notch is bent obllquely upward to form a tongue 8. The portlon of the body at the other side of each notch. is bent obliquely downward to form. a tongue 9. By having the tongues extend in opposite directions from the body 5, the contiguous face of the work I), as well as the under face of the nut a is engaged and gripped securely. In order to facilitate bending of the metal, slits 11 are formed in the body 5 at the inner ends of the notches 7. These slits are strai ht and extend at right angles to the note es. They permit the tongues to bend so that all parts thereof lie flat and project obliquely at the same angle from the body. The free ends 10 of the tongues 8 and 9 are disposed in planes which are substantially parallel to the body 5 and to one another: As a result of this arrangement the outer corners 12 of the tongues pre-= sent elongated sharp edges which are parallel to the body and grip the nut and work throughout their entire radial length. In bending the tongues relatively to the body, the metal stretches and tends to increase the circumferential length of the tongues. To

revent the ton ues from overlapping when Eorced together y the action of the nut (1 the notches 7 are made of suficient width. In the event that the washer is to be used as an electrical connector an arm 14 is formed on the body 5.

In the form of washer exhibited in Figure 4: the tongues 8 and 9' are formed at the outer margin of the body 5' instead of the inner margin. The arrangement of the tongues is, however, similar to that of the tongues 8 and 9. i

The washer herein disclosed is exceedingly simple as far as construction is concerned and operates efliciently by virtue of the fact that provision is made for preventing the tongues tlti from overlapping in the event that the are stretched when bent outwardly relathely to the body. By using straight slits 11 in the body, the tongues are of maximum strength and bonding is facilitated.

The invention is not to be understood as restricted to the details set forth, since these may be modified Within the scope of he ap pended claims without departing from the spirit and scope of the invention.

Having thus described the invention, What I claim as new and desire to secure by Letters Patent, is:

l. A lockwasher consisting of a flat ringshaped body formed of thin resilient metal and having an annular series of radiallv ex-- tending notches cut in one of the margins thereof, said body being slit circumferentially at the inner ends of the notches to form tongues at the sides of the notches, said tongues being bent obliquely relar ix ely to the body so that the free or outer edgy s 1 hereof are parallel. to the body, the notch: being of such Width that sufficient material is removed from the body between the 110i. gues to prevent said tongues from overlapping in the event they stretch as a result of being bent obliquely.

2. A look-Washer consisting of a flat ringshaped body formed of thin resilient metal and having an annular series of radially extending notrhes cut in one of the margins thereof, said body having straight slits at the inner ends of the notches to form tongues at the sides of the notches said tongues being bent obliquely relatively to the body so that the tree or outer edges thereof are parallel to the body, the notches being of such Width that sufiicient material is removed from the body between the tongues to prevent said tongues from overlapping in the event they stretch as a result of being bent obliquely.

Signed at Chicago, Illinois, this 8th day of May, 1929.

ARlHUR H. THOMPSON.

m'ragrea 

